21 Leonis Minoris

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21 Leonis Minoris
21LMiLightCurve.png
A light curve for 21 Leonis Minoris plotted from TESS data [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Leo Minor
Right ascension 10h 07m 25.76296s [2]
Declination +35° 14 40.8965 [2]
Apparent magnitude  (V)4.47–4.52 [3]
Characteristics
Spectral type A7V [4]
U−B color index +0.08 [5]
B−V color index +0.18 [5]
Variable type δ Sct [3]
Astrometry
Radial velocity (Rv)−11.40 ± 0.9 [6]  km/s
Proper motion (μ)RA: 52.90 [2]   mas/yr
Dec.: 0.62 [2]   mas/yr
Parallax (π)35.41 ± 0.18  mas [2]
Distance 92.1 ± 0.5  ly
(28.2 ± 0.1  pc)
Absolute magnitude  (MV)+2.43 [7]
Details
Mass 1.75 [8]   M
Radius 1.75 [8]   R
Luminosity 9.91 [8]   L
Surface gravity (log g)4.07 [9]   cgs
Temperature 7,839 [9]   K
Metallicity [Fe/H]0.03±0.08 [8]   dex
Rotational velocity (v sin i)155 [10]  km/s
Age 390 [10]  Myr
750 [8]   Myr
Other designations
21 LMi, BD+35°2110, GJ  378.3, 9314, HD  87696, HIP  49593, HR  3974, SAO  61874 [11]
Database references
SIMBAD data

21 Leonis Minoris is a star in the constellation of Leo Minor. With an apparent magnitude of about 4.5, the star is faintly visible to the naked eye (see Bortle scale). Parallax estimates made by the Hipparcos spacecraft put it at a fairly close distance of about 92.1 light-years (28.2 parsecs ) away from the Earth. [2] It is considered a member of the Sirius supercluster. [7]

21 Leonis Minoris rotates fairly fast for a star; its projected rotational velocity is estimated to be 155 km/s [10] so it must be rotating at least that fast. It has been listed as a fast-rotating spectral standard star for the spectral type of A7V, as opposed to the slow-rotating standard star 2 Hydrae. [12] It is also a Delta Scuti variable, and its apparent magnitude varies from 4.47 to 4.52. [3]

21 Leonis Minoris has an infrared excess, suggesting a debris disk around it. [10] The black body fit has a temperature of 60  K with an orbital radius of 62  AU . [8]

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References

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